Charge and Discharge Processes and Sodium Storage in Disodium Pyridine‐2,5‐Dicarboxylate Anode—Insights from Experiments and Theory,Advanced Energy Materials

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Charge and Discharge Processes and Sodium Storage in Disodium Pyridine‐2,5‐Dicarboxylate Anode—Insights from Experiments and Theory
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-11-08 , DOI: 10.1002/aenm.201701572
Harihara Padhy _{1,

2} , Yingqian Chen ₁ , Johann Lüder ₁ , Satyanarayana Reddy Gajella ₁ , Sergei Manzhos ₁ , Palani Balaya ₁

Affiliation

A combined experimental and computational study of disodium pyridine‐2,5‐dicarboxylate (Na₂PDC) is presented exploring the possibility of using it as a potential anode for organic sodium‐ion batteries. This electrode material can reversibly insert/release two Na cations per formula unit, resulting in high reversible capacity of 270 mA h g⁻¹ (236 mA h g⁻¹ after accounting for the contribution from Super P carbon) with excellent cyclability 225 mA h g⁻¹, with retention of 83% capacity after 100 cycles, and good rate performance with reversible capacity of 138 mA h g⁻¹ at a 5 C rate. The performance of disodium pyridine dicarboxylate is therefore found to be superior to that of the related and well investigated disodium terephthalate. The material shows two voltage plateaus at about 0.6 V up to Na₂₊₁PDC and then 0.4 V up to full sodiation, Na₂₊₂PDC. The first plateau is attributed to the coordination of inserted Na to nitrogen atoms with bond formation, i.e., a different mechanism from the terephthalate analog. The subsequent plateau is due to coordination to the carboxylic groups.

中文翻译：

吡啶-2,5-二羧酸二钠阳极中的充电和放电过程以及钠的储存-来自实验和理论的见解

吡啶-2-5，2-二羧酸二钠（Na ₂ PDC）的实验和计算研究相结合，探讨了将其用作有机钠离子电池的潜在阳极的可能性。该电极材料可在每个配方单元中可逆地插入/释放两个Na阳离子，从而可产生270 mA hg ^-1的高可逆容量（考虑到Super P碳的贡献后为236 mA hg ^-1），具有出色的可循环性225 mA hg ^-1，在100次循环后保持83％的容量，并具有良好的速率性能，可逆容量为138 mA hg ^-1以5 C的速率。因此，发现吡啶二羧酸二钠的性能优于相关的和经过充分研究的对苯二甲酸二钠的性能。该材料在Na _{2 + 1} PDC最高约0.6 V时显示出两个电压平稳状态，然后在Na _{2 + 2} PDC完全饱和时在0.4 V时出现两个电压稳定值。第一平台期归因于插入的Na与氮原子的配位形成配位，即与对苯二甲酸酯类似物的机理不同。随后的平稳期是由于对羧基的配位。

更新日期：2017-11-08

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